Tong 1 Digital Imaging And PACS

Question 1

What are the physical components of a typical PACS system?

Answer 1

• acquisition devices
• network switches
• broker
• database / image server
• web server
• archive server
• primary / secondary display
• web-based clinical review

Question 2

Name current network technologies and their respective bandwidths (i.e. transfer speed)

Answer 2

Modem = 56 kbits/sec
T1 = 1.54 Mbits/sec
Ethernet = 10 Mbits/sec
Fast Ethernet = 100 Mbits/sec
Asynchronous transfer mode (ATM) = 155 Mbits/sec
Gigabit Ethernet = 1 Gbit/ sec

Question 3

What is RAID?

Answer 3

Redundant array of independent disks.

It is a data storage virtualisation technology that’s combines multiple physical disk drive components into a single logical unit for the purpose of data redundancy and performance improvement.

Question 4

How many levels are there of RAID

Answer 4

Level 0
Level 1
Level 5
Level 6

Question 5

What are the properties of RAID 0 ?

Answer 5

• striping technology
• min disks:2
• space efficiency = n

Question 6

What are the properties of RAID 1 ?

Answer 6

• mirroring technology
• min disks: 2
• space efficiency = n

Question 7

What are the properties of RAID 5 ?

Answer 7

• Striped set with distributed parity technology
• min disks: 3
• space efficiency: n-1

Question 8

What are the properties of RAID 6 ?

Answer 8

• striped set with dual distributed parity
• min disks = 4
• space efficiency = n-2

Question 9

What is hierarchical storage management (HSM)

Answer 9

A data storage technique which automatically moves dat between high-cost and low cost storage media (to avoid technological obsolescence)

Question 10

Name 5 common file system

Answer 10

NTFS
XFS
FAT32
QFS
Ext3

Question 11

What is GSDF?

Answer 11

Grayscale standard display function

To promote identical grayscale image display on different monitors and consistent hard copy images from various printers